BE1030988B1 - Load contact assembly with a heat capacity element - Google Patents

Abstract

A load contact assembly (L; L') for a plug connector part (5) comprises: at least one plug contact (51A, 51B) for electrically contacting a mating contact element (31) of a mating plug connector part (3) and a busbar (55A-55D) with a first connecting section (550), on which the at least one plug contact (51A, 51B) is mounted in an electrically conductive manner on the busbar (55A-55D), and a second connecting section (551) for connecting an electrical load line (53A, 53B). It is provided that a section (A) of the busbar (55A-55D) is at least partially enclosed by at least one heat capacity element (54A-54E) for absorbing heat from the busbar (55A-55D).

Description

Load contact assembly with a heat capacity element

The invention relates to a load contact assembly for a connector part, a

Connector part with such a load contact assembly and a method for

Manufacturing of such a load contact assembly.

Particularly in the field of e-mobility, connectors and associated cable harnesses are subject to the highest requirements in terms of current carrying capacity and the associated thermal loads. In addition to the cables, the

Connectors are regularly exposed to high charging currents, e.g. of 700 amps and more. These high currents should be transmitted with as little power loss as possible. Against this background, it is worth mentioning that the power loss increases quadratically with the current.

Particularly in the case of vehicle-side connector parts, the resulting

Heat stress typically only occurs intermittently, namely during the individual

Charging processes which are usually spaced apart by longer periods of time.

For fast charging with direct current, charging times are currently typically between 10 and 30 minutes, although these charging times are expected to be shortened further in the future. Due to the large masses of the current-carrying parts, the heating curves are so pronounced that the equilibrium temperature is sometimes only reached after several minutes, even at higher currents. The norm stipulates that at any time during charging, no component within the connector may have a

temperature increase of more than 50 Kelvin. Due to the normative

Definition of connectors in the field of e-mobility, it is usually not possible to simply scale the geometries of the plug contacts in order to achieve a larger

current carrying capacity and a lower temperature increase. Rather, the existing standardized connector geometries are intended to achieve the greatest possible

Power transmission can be achieved and at the same time the resulting electricity heat in the

Connectors can be made controllable.

This has often been successfully achieved with actively cooled connectors and charging cables. However, the technical effort that usually has to be made for this is reflected in the costs and effort for the production of the actively cooled

Components of the corresponding charging devices.

In DE 10 2016 105 308 A1 a vehicle charging socket with

Heat capacity elements are described, each of which is attached to a shaft of a

The described heat capacity elements have a

Phase change material that delays the heating of the plug contacts and thus enables longer charging times or higher charging currents.

DE 10 2019 104 655 A1 concerns a high-current wiring between a

charging connector and a traction battery of a vehicle. The

High current wiring has a cooling housing. In this way, a high

Heating of the vehicle's charging connector due to

Heat flowing back through the battery cable can be avoided. This allows the

Charging connectors must be protected from the effects of additional heat.

EP 0 668 632 A2 describes an electrical connection arrangement in which a

The end section of a cable is connected to a heat sink of an electrical device. This solution has only limited uses and is also very complex to manufacture.

The object of the present invention is to provide particularly easy-to-manufacture

To enable connector parts that allow high charging currents.

This object is solved by an article having the features of claim 1.

Accordingly, a load contact assembly is specified for a connector part. The

Load contact assembly comprises at least one plug contact (in particular several, e.g. two, such plug contacts) for electrical contact with (each) one

Mating contact element of a mating connector part. Furthermore, the

Load contact assembly a busbar with a first connecting section, on which the at least one plug contact is mounted electrically conductively on the busbar, and a second connecting section for connecting an electrical

Load line. It is provided that a section of the busbar is partially, predominantly, essentially completely or completely enclosed by at least one heat capacity element for absorbing heat from the busbar. The

Busbar is e.g. inserted into the heat capacity element, in particular through the

Heat capacity element inserted through.

This is based on the knowledge that such an arrangement of the

heat capacity element provides particularly effective heat transfer to the

Heat capacity element is possible and it is particularly simple and cost-effective to manufacture, since the heat capacity element can, for example, be simply plugged onto the busbar. Thus, the load contact assembly

Connector parts that are particularly easy to manufacture and allow high charging currents. Despite the high charging currents, no active cooling of the

load contact assembly and the connector part are necessary.

The plug contact is for electrical contact with the counter contact element of the

The mating connector part can be plugged into the mating contact element in one plugging direction.

It can be provided that the at least one heat capacity element in a

Angle to the plug-in direction, in particular perpendicular to the plug-in direction, on the busbar. This enables a particularly space-saving design and also particularly simple installation.

The said section of the busbar with the at least one

Heat capacity element can be arranged between the first connecting section and the second connecting section of the busbar. This enables the

Use of a relatively large heat capacity element and also particularly simple and safe installation.

The load contact assembly can comprise a further heat capacity element. The busbar can also be plugged into this further heat capacity element. Optionally, the first connection section between the

Heat capacity element and the further heat capacity element.

This allows an even larger amount of heat to be absorbed, and at the same time particularly effectively.

The busbar is, for example, in an opening, in particular a

through opening of the at least one heat capacity element. The

The busbar can be pressed into the opening with at least one heat capacity element. This enables particularly simple assembly, since no

Screw connection is necessary. In addition, a largely automated production of the load contact assembly is possible.

Optionally, the heat capacity element can be connected to several pressings with the

Busbar pressed together so that the busbar fits snugly into the pressings in the

The compressions are each shaped the same. This allows for a particularly secure installation of the

heat capacity element on the busbar. In addition, such

Pressings can be produced particularly well in an automated manner.

Alternatively or additionally, the busbar can be pressed into the opening of the at least one heat capacity element with an oversize. This enables particularly good heat transfer and production with particularly few

manufacturing steps, since insertion and pressing can be done in one operation.

The at least one heat capacity element is optionally a section of a

Extruded profiles. This makes it possible to simplify the manufacture of the heat capacity element or elements, simply by cutting the extruded profile to a predetermined length(s) to form the

Heat capacity element/heat capacity elements. The heat capacity element has, for example, two opposite (in particular parallel to each other) end faces.

The end faces in particular have the same shape as one another. Any two corresponding points on the two end faces are connected by a straight line. It can be provided in particular that all of these straight lines of the

heat capacity element run parallel to each other.

The busbar, for example, has a rectangular cross-section. This enables easy production. For example, the busbar is a stamped part. The busbar is made of copper, for example.

The load line is connected to the second connection section in an assembled state.

The heat capacity element may comprise or consist of aluminum or an aluminum alloy. This allows the heat capacity element to be manufactured inexpensively and in a lightweight manner. Alternatively or additionally, the

Heat capacity element is a phase change material that, when heated,

Phase transition, for example from solid to liquid, and is therefore able to absorb a large amount of heat energy. Such phase change materials use the

Enthalpy of thermodynamic changes in the state of a storage medium, for example a phase transition from solid to liquid and vice versa.

Phase change materials can be, for example, salts or paraffins as

It is also conceivable to use low-melting

Metal alloys, for example a so-called Field metal, can be used.

According to one aspect, a connector part, e.g. for a charging system for charging an electric vehicle, is provided. The connector part comprises the

Load contact assembly according to any embodiment described herein and a

Housing with a plug section for the at least one plug contact to the plug-in

Connecting to a mating connector part. Regarding the advantages, please refer to the above

Information on the load contact assembly is referred to.

According to one aspect, a method for producing a load contact assembly for a connector part is provided, in particular for producing the

Load contact assembly according to any embodiment described herein. The

The method comprises the following steps in any order (alternatively in the exact order specified): mounting at least one plug contact in an electrically conductive manner on a first connecting section of a busbar, the busbar having a second connecting section for connecting an electrical load line; and inserting the busbar into an opening of at least one

Heat capacity element, wherein the at least one heat capacity element for

Absorbing heat from the busbar and pressing the

Busbar when plugging in or afterward with the opening. Regarding the

Advantages, reference is made to the above information on the load contact assembly.

Optionally, the at least one heat capacity element is connected to several

Crimpings with the busbar pressed so that the busbar is at the

Pressings are held in a form-fitting manner in at least one heat capacity element.

Alternatively or additionally, the busbar is pressed, for example with an excess, into the opening of the at least one heat capacity element.

The at least one heat capacity element can be manufactured by cutting a piece from an extruded profile.

The idea underlying the invention will be explained in more detail below using the embodiments shown in the figures. They show:

Fig. 1 is a view of a charging station with a

Charging cable for connecting to an electric vehicle;

Fig. 2 is a view of a mating connector part to a

Connector part in the form of a charging plug;

Fig. 3A and 3B views of an embodiment of a connector part in

Shape of a charging socket of the electric vehicle according to Fig. 1;

Fig. 4 is a view of the connector part according to Figs. 3A and 3B, without a rear cover;

Fig. 5 is an exploded view of the connector part according to Fig. 4;

Fig. 6A and 6B are views of a plug contact of the connector part according to Fig. 3A and 3B with a busbar connected thereto and a thermal capacity element mounted on the busbar;

Fig. 7 is a view of the plug contact according to Fig. 6A and 6B with the busbar connected thereto and the thermal capacity element before mounting on the busbar;

Fig. 8A and 8B views of the heat capacity element according to Fig. 7 before

Assembly;

Fig. 9 a view of the plug contact with the connected

Busbar and the busbar mounted and connected to the

forming the joined heat capacity element;

Fig. 10 is a view showing the busbar and the

Heat capacity element after forming during assembly are shown separately from each other;

Fig. 11 is a partially cutaway view of the device shown in Fig. 9

Busbar mounted thermal capacity element;

Fig. 12 a view of a plug contact with a connected

Busbar and a power rail mounted on the busbar and

undersized heat capacity element;

Fig. 13 is a partially cutaway view of the device shown in Fig. 12

Busbar mounted thermal capacity element;

Fig. 14 is a view of an embodiment of a connector part in

Shape of a charging socket of the electric vehicle according to Fig. 1, without a rear cover;

Fig. 15 is an exploded view of the connector part according to Fig. 14;

Fig. 16A and 16B Views of a plug contact of the connector part according to Fig. 14 with a busbar connected thereto and several

Busbar mounted thermal capacity elements;

Fig. 17A and 17B are views of one of the heat capacity elements according to Fig. 16A and 16B before assembly; and

Fig. 18 is a view of another heat capacity element.

Fig. 1 shows a charging system comprising a charging station 1, which serves to charge an electrically powered vehicle 4, also referred to as an electric vehicle. The

Vehicle 4 has a connector part 5 in the form of a charging socket. The charging station 1 is designed to provide a charging current in the form of an alternating current or a

direct current and has a cable 2 which is connected at one end 201 to the charging station 1 and at another end 200 to a mating connector part 3 in the form of a charging plug.

As can be seen from the enlarged view in Fig. 2, the

Mating connector part 3 on a housing 30 has plug sections 300, 301 with which the mating connector part 3 can be plugged into the associated connector part 5 on the vehicle 4. In this way, the charging station 1 can be electrically connected to the vehicle 4 in order to transmit charging currents from the charging station 1 to the vehicle 4. The vehicle 4 comprises a traction battery for providing electrical energy to one or more electric motors of the

Vehicle 4, wherein the traction battery can be charged by means of the charging currents.

In order to enable rapid charging of the traction battery of the vehicle 4, e.g. in the context of a so-called quick charging process, the transmitted charging currents have a high current intensity, e.g. greater than 500 A, possibly even 700 A or more. Due to such high charging currents, the cable 2 and also the

charging plug 3 and the connector part 5 to thermal losses, which lead to a

Heating of the cable 2, the charging plug 3 and the connector part 5.

The permissible heating of components of the charging system is limited by standards, for example to a maximum value of 50 K. Therefore, measures are taken to prevent excessive heating during charging, especially when large

Current intensities, for example in the order of 700 A or more, can be used.

While the charging cable 2 connected to the charging station 1 and the

While charging plugs 3 can usually be used with only short interruptions to carry out repeated charging processes on vehicles in quasi-continuous operation, an electric vehicle 4 is usually charged in a charging process lasting, for example, 10-30 minutes, but then over a longer period

period of time, so that the connector part 5 on the vehicle 4 can cool down after the charging process. Different cooling measures are therefore required on the charging cable 2 and the charging plug 3 than on the connector part 5 arranged on the vehicle 4.

Heating of the connector part 5 arranged on the electric vehicle 4 can be counteracted, for example, by reducing the thermal inertia at the

Connector part 5 is increased so that heating at connector part 5 is slowed down during charging. This can ensure that excessive heating does not occur during the charging process, but rather the

Heating is slowed down even at high currents so that a permissible

limit temperature is not reached.

In an embodiment of a

Connector part 5 in the form of a to be arranged on an electric vehicle 4

Charging socket 50 plug-in sections 500, 501 are formed on a housing, which are arranged along the

Plugging direction E with the plug sections 300, 301 of the mating connector part 3 in

form of the charging plug, in order to create a mechanical

To establish a plug connection between the charging plug 3 and the connector part 5.

Contact elements 52 for transmitting an alternating current and also control contacts are arranged on an upper plug section 500 of the plug connector part 5. In contrast, plug contacts 51A, 51B for transmitting a charging current in the form of a direct current are arranged on a lower plug section 501.

The plug contacts 51A, 51B can be designed as pin contacts, for example, and are connected when the plug connector part 5 in the form of the charging socket is plugged into the mating plug connector part 3 in the form of the charging plug with associated

Mating contact elements 31 on the plug section 301 in electrical engagement, so that an electrical connection between the connector part 5 and the

Mating connector part 3 is manufactured.

The plug contacts 51A, 51B are each electrically connected to a load line 53A, 53B, which is inserted into the housing 50 and inside the electric vehicle 4 to

Carrying the charging current is laid.

While Fig. 3A and 3B show the connector part 5 in the form of the charging socket in perspective views from the front and from the back, Fig. 4 shows the

Connector part 5 without a rear, facing away from the plug sections 500, 501

Cover 502. Visible inside the housing 50 are the

Contact elements 52 projecting from the plug section 500. Also visible are (two)

Load contact assemblies L of connector part 5.

The load contact assemblies L each comprise one of the plug contacts 51A, 51B, one busbar 55A, 55B and one thermal capacity element 54A, 54B for

Absorbing heat from the busbar 55A, 55B. The busbars 55A, 55B are assigned to the plug contacts 51A, 51B and connected to the load lines 53A, 53B via

Connection elements 530 in the form of cable lugs. Each of the two

Plug contacts 51A, 51B are electrically connected to the corresponding load line 53A, 53B via a respective busbar 55A, 55B.

The busbar 55A, 55B of each of the load contact assemblies has a first

Connection section 550, on which the respective plug contact 51A, 51B is mounted electrically conductively on the busbar 55A, 55B (e.g. by means of a screw connection), and a second connection section 551 for connecting the respective electrical

Load line 53A, 53B. A section A (see e.g. Fig. 7) of the busbar 55A, 55B is enclosed by the respective heat capacity element 54A, 54B. In relation to a cross-sectional plane, the respective heat capacity element 54A, 54B completely encloses the corresponding busbar 55A, 55B. The heat capacity elements 54A, 54B are made of aluminum in the present case.

The first and second connecting sections 550, 551 are each connected, for example, by a

Opening in the respective busbar 55A, 55B. The respective plug contact 51A, 51B is attached to the first connection section 550, for example by means of a screw connection. The respective connection element 530 of the corresponding load line 53A, 53B is attached to the second connection section 551 by means of a screw 531 and a nut 532 (see, for example, Fig. 5 to 6B).

The busbars 55A, 55B are elongated and are aligned with their longitudinal extension perpendicular to the plug-in direction E. The busbars 55A, 55B are flat, i.e., in a

spatial direction is much less extensive than in the other two spatial directions.

The busbars 55A, 55B have a rectangular shape. The

Busbars 55A, 55B have the same external shape. Furthermore, the

Busbars 55A, 55B aligned parallel to each other.

The section A of the respective busbar 55A, 55B with the heat capacity element 54A, 54B is arranged between the respective first and second connecting sections 550, 551 of the busbar 55A, 55B. The heat capacity element 54A, 54B is held captive between the respective plug contact 51A, 51B and the corresponding load line 53A, 53B together with the respective connection element 530.

The busbar 55A, 55B of each load contact assembly L is inserted into an opening 540 of the respective heat capacity element 54A, 54B and pressed into the opening 540 with the heat capacity element 54A, 54B. The insertion process can be seen, for example, in Fig. 7.

For good heat transfer and secure fixation of each

Heat capacity element 54A, 54B on the respective busbar 55A, 55B is provided that the respective heat capacity element 54A, 54B is pressed to the busbar 55A, 55B at several (here six) pressings V. By the

By means of the compressions V, the busbar 55A, 55B is held in a form-fitting manner in the opening 540 of the heat capacity element 54A, 54B at the compressions V (and vice versa).

The pressings V are illustrated in Fig. 9, for example. There is also a

Stamp S for inserting the compressions V is shown. Optionally, a tool with several such stamps S is provided, which can insert several or all of the compressions V in one step. For this purpose, after attaching the

Heat capacity element 54A, 54B to the busbar 55A, 55B perpendicular to the

The stamp S is pressed into the material of the heat capacity element 54A, 54B, e.g. aluminum, in the direction of insertion. This deforms plastically and the material (e.g. copper) of the busbar 55A, 55B is also deformed.

Fig. 10 illustrates for illustration purposes the following insertion of the

Pressings V parts that can no longer be separated from each other without destruction, the

Heat capacity element 54A, 54B and the busbar 55A, 55B, separately.

By inserting the pressings V, embossings P are introduced into the busbar, which in the pressed state are filled by material of the heat capacity element 54A, 54B. This is illustrated, for example, in Fig. 11. Thus, the

Heat capacity element 54A, 54B and the busbar 55A, 55B are held together in a form-fitting manner.

The opening 540 in the heat capacity element 54A, 54B is a through-opening. Apart from the two opposite accesses on the front surfaces of the

Heat capacity element 54A, 54B completely from material of

Heat capacity element 54A, 54B. This results in a good

Heat transfer from the busbar 55A, 55B to the heat capacity element 54A, 54B.

The heat capacity element 54A, 54B is shown separately in Fig. 8A and 8B. It has a rectangular body 541, next to which a section with the opening 540 is arranged. The body 541 is solid. The heat capacity element 54A, 54B is a piece of an extruded profile P, which is schematically illustrated in Fig. 8A. To produce the heat capacity elements 54A, 54B, pieces can simply be cut off from the extruded profile P.

Alternatively or in addition to the introduction of the pressings V, it can be provided that the busbar 55A, 55B is pressed with an excess into the opening 540 of the at least one heat capacity element 54A, 54B and then, as shown by

_ BE2022/5855 of Fig. 12 and 13. The opening 540 is manufactured, for example, with rounded corners and the busbar 55A, 55B, for example, with comparatively sharp-edged corners.

When pressed into the opening, the busbar 55A, 55B displaces material of the

Heat capacity element 54A, 55B in material displacement areas M. Alternatively or additionally, the width and/or extent of the opening 540 is smaller than the corresponding width and/or thickness of the busbar 55A, 55B. This enables a particularly secure fixation and a large-area and good heat transfer.

The solution described enables a cost-effective and weight-saving

Connector part 5. In particular, production is simple and can be automated to a large extent. Furthermore, a reliable heat transfer can be guaranteed.

Fig. 14 to 17B illustrate load contact assemblies L' for the connector part 5, which, in comparison to the load contact assembly L described above, has a busbar 55C, 55D which extends beyond the first connection section 550. On this section of the respective busbar 55C, 55D, a further, i.e. second, heat capacity element 54C, 54D per load contact assembly L' is arranged, into which the busbar 55C, 55D is also plugged.

In each case, the first connecting section 550 between the one

Heat capacity element 54A, 54B and the further heat capacity element 54C, 54D.

The additional heat capacity element 54C, 54D is smaller (more precisely: shorter) than the

Heat capacity element 54A, 54B between the first and second

Connecting section 550, 551. The respective further heat capacity element 54C, 54D is also a piece of the extruded profile P.

This allows an even greater amount of heat to be absorbed.

The idea underlying the invention is not limited to the previously described

The concept is not limited to specific embodiments, but can also be implemented in a completely different way.

In principle, heat capacity elements of the type described here can be

Connector parts in the form of charging sockets or charging plugs as part of a

Charging system for charging an electric vehicle. However, it is also conceivable and possible to use it in completely different connector parts outside of a charging system for charging an electric vehicle.

A heat capacity element of the type described here can not only be used on one

Contact element for transmitting a direct current, but also on a contact element for transmitting an alternating current.

All contact elements on a connector part can be connected to a

Heat capacity element, whereby it is also conceivable and possible to use only one

Subgroup of contact elements with an assigned

Heat capacity element to be fitted.

Fig. 18 shows another heat capacity element 54E which has the features described herein.

Load contact assemblies L; L'. This heat capacity element 54E is designed here, for example, essentially like the heat capacity element 54C according to Fig. 17A and 17B, but could also be designed essentially like one of the other heat capacity elements described herein. In contrast, the heat capacity element 54E has a slot 542. The slot 542 allows the

Opening 540 is open on one side along its length. The heat capacity element 54E thus only partially surrounds the corresponding busbar 55A-55D. The

Heat capacity element 54E forms a C-shaped section in which the

Busbar 55A-55D can be arranged (and recorded in the assembled state). If the

Heat capacity element 54E is mounted, then the corresponding section A of the

Busbar 55A-55D through the heat capacity element 54E for receiving

Heat is partially enclosed by the busbar 55A-55D. Section A is then largely enclosed, namely more than half of its

Shell surface, in this case also more than two thirds and also more than three quarters of its shell surface. Optionally, the slot 542 is made very small and serves primarily to allow spreading when inserting the busbar 55A-55D.

List of reference symbols 1 charging station 2 charging cable 200, 201 end 3 charging plug 30 housing 300, 301 plug-in section 31 counter contact element 4 vehicle 5 connector part 50 housing 500, 501 plug-in section 502 rear cover 514, 51B plug-in contact 52 contact elements 53A, 53B load line 530 connection element 531 screw 532 nut 54A-54E heat capacity element 540 opening 541 body 542 slot 55A-55D bus bar 550 first connection section 551 second connection section

A Section

E Plug direction

L;L Load contact assembly

M Material displacement area

P Extruded profile

R embossing

S Stamp

V Pressing

Claims (16)

Patent claims 1. Load contact assembly (L; L') for a plug connector part (5), comprising: - at least one plug contact (51A, 51B) for electrically contacting a mating contact element (31) of a mating plug connector part (3) and - a busbar (55A-55D) with a first connecting section (550), on which the at least one plug contact (51A, 51B) is mounted in an electrically conductive manner on the busbar (55A-55D), and a second connecting section (551) for connecting an electrical load line (53A, 53B), characterized in that a section (A) of the busbar (55A-55D) is at least partially enclosed by at least one heat capacity element (54A-54E) for absorbing heat from the busbar (55A-55D). 2. Load contact assembly (L; L) according to claim 1, characterized in that the plug contact (51A, 51B) for electrical contact with the mating contact element (31) of the mating connector part (3) can be plugged into the mating contact element (31) in a plugging direction (E), wherein the at least one heat capacity element (54A-54E) is plugged onto the busbar (55A-55D) perpendicular to the plugging direction (E). 3. Load contact assembly (L; L° according to claim 1 or 2, characterized in that the section (A) of the busbar (55A-55D) with the at least one heat capacity element (54A, 54B) is arranged between the first connecting section (550) and the second connecting section (551) of the busbar (55A-55D). 4. Load contact assembly (L) according to one of the preceding claims, characterized by a further heat capacity element (54C, 54D) into which the busbar (55C, 55D) is inserted, wherein the first connecting section (550) is arranged between the at least one heat capacity element (54A, 54B) and the further heat capacity element (54C, 54D). 5. Load contact assembly (L; L') according to one of the preceding claims, characterized in that the busbar (55A-55D) is pressed into an opening (540) of the at least one heat capacity element (54A-54E) with the at least one heat capacity element (54A-54E). 6. Load contact assembly (L; L') according to claim 5, characterized in that the heat capacity element (54A-54E) is pressed with the busbar (55A-55D) at a plurality of pressings (V) in such a way that the busbar (55A-55D) is held in the heat capacity element (54A-54E) in a form-fitting manner at the pressings (V). 7. Load contact assembly (L; L°) according to claim 5 or 6, characterized in that the busbar (55A, 55B) is pressed with an excess into the opening (540) of the at least one heat capacity element (54A-54E). 8. Load contact assembly (L; L') according to one of the preceding claims, characterized in that the at least one heat capacity element (54A-54E) is a section of an extruded profile (P). 9. Load contact assembly (L; L') according to one of the preceding claims, characterized in that the busbar (55A-55D) has a rectangular cross-section. 10. Load contact assembly (L; L') according to one of the preceding claims, characterized in that the load line (53A, 53B) is connected to the second connecting section (551). 11. Load contact assembly (L; L') according to one of the preceding claims, characterized in that the at least one heat capacity element (54A-54E) comprises or consists of aluminum or an aluminum alloy. 12. Connector part (5) for a charging system for charging an electric vehicle (4), comprising: - the load contact assembly (L; L') according to one of the preceding claims and - a housing (50) with a plug-in section (501) for the at least one plug contact (51A, 51B) for plug-in connection with a mating connector part (3). 13. Method for producing a load contact assembly (L; L') for a plug connector part (5), in particular the load contact assembly (L; L) according to one of claims 1 to 11, comprising the following steps in any order: - mounting at least one plug contact (51A, 51B) in an electrically conductive manner on a first connecting section (550) of a busbar (55A-55D), the busbar (55A-55D) having a second connecting section (551) for connecting an electrical load line (53A, 53B); and - inserting the busbar (55A-55D) into an opening (540) of at least one heat capacity element (54A-54E) for absorbing heat from the busbar (55A-55D) and pressing it into the opening (540). 14. The method according to claim 13, characterized in that the at least one heat capacity element (54A-54E) is pressed with the busbar (55A-55D) at a plurality of pressings (V) in such a way that the busbar (55A-55D) is held in a form-fitting manner in the at least one heat capacity element (54A-54E) at the pressings (V). 15. Method according to claim 13 or 14, characterized in that the busbar (55A-55D) is pressed with an excess into the opening (540) of the at least one heat capacity element (54A-54E). 16. Method according to one of claims 13 to 15, characterized in that the at least one heat capacity element (54A-54E) is produced by cutting off an extruded profile (P).